Soutenance de thèse de Kimsrornn KHON

Jury :
Corinne ALONSO, Examinatrice, Professeur des Universités, Université Toulouse 3 - Paul Sabatier
Marc PETIT, Rapporteur, Professeur des Universités, CentraleSupélec, Université Paris Saclay
Salvy BOURGUET, Rapporteur, Maître de Conférences HDR, Polytech Nantes, Nantes Université
Bertrand RAISON, Directeur de thèse, Professeur des Universités, Université Grenoble Alpes
Long BUN, Co-directeur de thèse, Enseignant-Chercheur, Institut de Technologie du Cambodge
Marie-Cécile ALVAREZ-HERAULT, Co-directrice de thèse, Maître de Conférences HDR, Université Grenoble Alpes
- Invite:
Vannak VAI, Co-directeur de thèse, Enseignant-Chercheur, Institut de Technologie du Cambodge
 
Abstract :
Recently,  DC-powered  devices  such  as  loads  (USB  plugs,  chargers,  LED  lighting)  and distributed  energy  resources  (solar  photovoltaic  and  battery  energy  storage)  have  been developed. To cope with these technological trends, an AC/DC microgrid could be an option for rural electrification in developing countries, especially in remote or rural areas. In Cambodia, the electrification rate is only about 82% of the population in 2021 in rural areas. The objective of this thesis is to challenge the traditional AC distribution network by proposing a new hybrid AC/DC microgrid in the context of electrification in developing countries. For this purpose, an algorithm for finding the optimal low-voltage AC/DC network topology has been developed. 
Secondly, a general methodology for the sizing and sitting of PVs and batteries in the AC/DC hybrid  microgrid  is  implemented.  Then,  the  "grid-connected"  and  "off-grid"  modes  of  the system are compared according to several technical, economic, and environmental indicators. 
Finally, the comparison of the AC/DC microgrid with fully AC microgrids has been performed on two real study cases (a rural area and an island area) and according to the two possible modes (grid-connected  and  off-grid).  Moreover,  the  uncertainty  of  the  loads  is  also  considered  to observe  the  sensitivity  and  robustness  of  the  proposed  algorithm.  The  results  show  that, although the overall cost of the hybrid AC/DC microgrid is slightly higher than that of the non-cluster  tree  AC  microgrid,  it  allows  for  gradual  electrification  thus  avoiding  large  initial investments.

Keys Words : AC/DC, microgrid, optimization, renewable energy, planning